I've got hints & tips, I would recommend calling 111 though, as you'll have to see a GP or Dr, as pharmacists can't help with this one.
It may seem crazy, 111 advocated I go to hospital, it was quick and painless, I couldn't apologise enough, the consultant on shift said they'd rather deal with it, than patients suffering.
Most hospitals have a triage system anyway, run usually by nurse practitioners, they can prescribe trimethoprim.
In the mean time, flush, flush, flush with water. If you can get cranberry juice that works to take the Ph of your urine down, to stop the burning.
If it's a frequently thing then Morrison's do the nicest incontinence pants. I know this sounds awful, sometimes your bladder decides to just do it's own thing.
Sodium citrate can be thought from super markets, it's purpose is the same as cranberries. You really need anti biotics.
If you're still up suffering PLEASE call 111 as UTI's can make you quite poorly.
All the best OP.